Ultimately the value of certification is proven by the knowledge of those attaining the certification in the workplace. This, in turn, causes greater demand for those certified, which increases demand by those looking to be employed in the certifying role. Because BC is still in its infancy, there is not a lot of information available to assess the value of current certifications.
In addition, I just don't know if I buy the format of exams for BC certification. BC requires a lot of writing, marketing, project management, research and analysis. Assessing this by means of a multiple-choice test seems inadequate, although admittedly some of the certifying organizations also require that applicants demonstrate experience. This, however, seems to also be an admission that the tests they require applicants to complete are an insufficient form of assessment.